1 /* 2 * dvb_demux.c - DVB kernel demux API 3 * 4 * Copyright (C) 2000-2001 Ralph Metzler <ralph@convergence.de> 5 * & Marcus Metzler <marcus@convergence.de> 6 * for convergence integrated media GmbH 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public License 10 * as published by the Free Software Foundation; either version 2.1 11 * of the License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 21 * 22 */ 23 24 #include <linux/sched.h> 25 #include <linux/spinlock.h> 26 #include <linux/slab.h> 27 #include <linux/vmalloc.h> 28 #include <linux/module.h> 29 #include <linux/poll.h> 30 #include <linux/string.h> 31 #include <linux/crc32.h> 32 #include <asm/uaccess.h> 33 #include <asm/div64.h> 34 35 #include "dvb_demux.h" 36 37 #define NOBUFS 38 /* 39 ** #define DVB_DEMUX_SECTION_LOSS_LOG to monitor payload loss in the syslog 40 */ 41 // #define DVB_DEMUX_SECTION_LOSS_LOG 42 43 static int dvb_demux_tscheck; 44 module_param(dvb_demux_tscheck, int, 0644); 45 MODULE_PARM_DESC(dvb_demux_tscheck, 46 "enable transport stream continuity and TEI check"); 47 48 static int dvb_demux_speedcheck; 49 module_param(dvb_demux_speedcheck, int, 0644); 50 MODULE_PARM_DESC(dvb_demux_speedcheck, 51 "enable transport stream speed check"); 52 53 static int dvb_demux_feed_err_pkts = 1; 54 module_param(dvb_demux_feed_err_pkts, int, 0644); 55 MODULE_PARM_DESC(dvb_demux_feed_err_pkts, 56 "when set to 0, drop packets with the TEI bit set (1 by default)"); 57 58 #define dprintk_tscheck(x...) do { \ 59 if (dvb_demux_tscheck && printk_ratelimit()) \ 60 printk(x); \ 61 } while (0) 62 63 /****************************************************************************** 64 * static inlined helper functions 65 ******************************************************************************/ 66 67 static inline u16 section_length(const u8 *buf) 68 { 69 return 3 + ((buf[1] & 0x0f) << 8) + buf[2]; 70 } 71 72 static inline u16 ts_pid(const u8 *buf) 73 { 74 return ((buf[1] & 0x1f) << 8) + buf[2]; 75 } 76 77 static inline u8 payload(const u8 *tsp) 78 { 79 if (!(tsp[3] & 0x10)) // no payload? 80 return 0; 81 82 if (tsp[3] & 0x20) { // adaptation field? 83 if (tsp[4] > 183) // corrupted data? 84 return 0; 85 else 86 return 184 - 1 - tsp[4]; 87 } 88 89 return 184; 90 } 91 92 static u32 dvb_dmx_crc32(struct dvb_demux_feed *f, const u8 *src, size_t len) 93 { 94 return (f->feed.sec.crc_val = crc32_be(f->feed.sec.crc_val, src, len)); 95 } 96 97 static void dvb_dmx_memcopy(struct dvb_demux_feed *f, u8 *d, const u8 *s, 98 size_t len) 99 { 100 memcpy(d, s, len); 101 } 102 103 /****************************************************************************** 104 * Software filter functions 105 ******************************************************************************/ 106 107 static inline int dvb_dmx_swfilter_payload(struct dvb_demux_feed *feed, 108 const u8 *buf) 109 { 110 int count = payload(buf); 111 int p; 112 //int ccok; 113 //u8 cc; 114 115 if (count == 0) 116 return -1; 117 118 p = 188 - count; 119 120 /* 121 cc = buf[3] & 0x0f; 122 ccok = ((feed->cc + 1) & 0x0f) == cc; 123 feed->cc = cc; 124 if (!ccok) 125 printk("missed packet!\n"); 126 */ 127 128 if (buf[1] & 0x40) // PUSI ? 129 feed->peslen = 0xfffa; 130 131 feed->peslen += count; 132 133 return feed->cb.ts(&buf[p], count, NULL, 0, &feed->feed.ts, DMX_OK); 134 } 135 136 static int dvb_dmx_swfilter_sectionfilter(struct dvb_demux_feed *feed, 137 struct dvb_demux_filter *f) 138 { 139 u8 neq = 0; 140 int i; 141 142 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) { 143 u8 xor = f->filter.filter_value[i] ^ feed->feed.sec.secbuf[i]; 144 145 if (f->maskandmode[i] & xor) 146 return 0; 147 148 neq |= f->maskandnotmode[i] & xor; 149 } 150 151 if (f->doneq && !neq) 152 return 0; 153 154 return feed->cb.sec(feed->feed.sec.secbuf, feed->feed.sec.seclen, 155 NULL, 0, &f->filter, DMX_OK); 156 } 157 158 static inline int dvb_dmx_swfilter_section_feed(struct dvb_demux_feed *feed) 159 { 160 struct dvb_demux *demux = feed->demux; 161 struct dvb_demux_filter *f = feed->filter; 162 struct dmx_section_feed *sec = &feed->feed.sec; 163 int section_syntax_indicator; 164 165 if (!sec->is_filtering) 166 return 0; 167 168 if (!f) 169 return 0; 170 171 if (sec->check_crc) { 172 section_syntax_indicator = ((sec->secbuf[1] & 0x80) != 0); 173 if (section_syntax_indicator && 174 demux->check_crc32(feed, sec->secbuf, sec->seclen)) 175 return -1; 176 } 177 178 do { 179 if (dvb_dmx_swfilter_sectionfilter(feed, f) < 0) 180 return -1; 181 } while ((f = f->next) && sec->is_filtering); 182 183 sec->seclen = 0; 184 185 return 0; 186 } 187 188 static void dvb_dmx_swfilter_section_new(struct dvb_demux_feed *feed) 189 { 190 struct dmx_section_feed *sec = &feed->feed.sec; 191 192 #ifdef DVB_DEMUX_SECTION_LOSS_LOG 193 if (sec->secbufp < sec->tsfeedp) { 194 int i, n = sec->tsfeedp - sec->secbufp; 195 196 /* 197 * Section padding is done with 0xff bytes entirely. 198 * Due to speed reasons, we won't check all of them 199 * but just first and last. 200 */ 201 if (sec->secbuf[0] != 0xff || sec->secbuf[n - 1] != 0xff) { 202 printk("dvb_demux.c section ts padding loss: %d/%d\n", 203 n, sec->tsfeedp); 204 printk("dvb_demux.c pad data:"); 205 for (i = 0; i < n; i++) 206 printk(" %02x", sec->secbuf[i]); 207 printk("\n"); 208 } 209 } 210 #endif 211 212 sec->tsfeedp = sec->secbufp = sec->seclen = 0; 213 sec->secbuf = sec->secbuf_base; 214 } 215 216 /* 217 * Losless Section Demux 1.4.1 by Emard 218 * Valsecchi Patrick: 219 * - middle of section A (no PUSI) 220 * - end of section A and start of section B 221 * (with PUSI pointing to the start of the second section) 222 * 223 * In this case, without feed->pusi_seen you'll receive a garbage section 224 * consisting of the end of section A. Basically because tsfeedp 225 * is incemented and the use=0 condition is not raised 226 * when the second packet arrives. 227 * 228 * Fix: 229 * when demux is started, let feed->pusi_seen = 0 to 230 * prevent initial feeding of garbage from the end of 231 * previous section. When you for the first time see PUSI=1 232 * then set feed->pusi_seen = 1 233 */ 234 static int dvb_dmx_swfilter_section_copy_dump(struct dvb_demux_feed *feed, 235 const u8 *buf, u8 len) 236 { 237 struct dvb_demux *demux = feed->demux; 238 struct dmx_section_feed *sec = &feed->feed.sec; 239 u16 limit, seclen, n; 240 241 if (sec->tsfeedp >= DMX_MAX_SECFEED_SIZE) 242 return 0; 243 244 if (sec->tsfeedp + len > DMX_MAX_SECFEED_SIZE) { 245 #ifdef DVB_DEMUX_SECTION_LOSS_LOG 246 printk("dvb_demux.c section buffer full loss: %d/%d\n", 247 sec->tsfeedp + len - DMX_MAX_SECFEED_SIZE, 248 DMX_MAX_SECFEED_SIZE); 249 #endif 250 len = DMX_MAX_SECFEED_SIZE - sec->tsfeedp; 251 } 252 253 if (len <= 0) 254 return 0; 255 256 demux->memcopy(feed, sec->secbuf_base + sec->tsfeedp, buf, len); 257 sec->tsfeedp += len; 258 259 /* 260 * Dump all the sections we can find in the data (Emard) 261 */ 262 limit = sec->tsfeedp; 263 if (limit > DMX_MAX_SECFEED_SIZE) 264 return -1; /* internal error should never happen */ 265 266 /* to be sure always set secbuf */ 267 sec->secbuf = sec->secbuf_base + sec->secbufp; 268 269 for (n = 0; sec->secbufp + 2 < limit; n++) { 270 seclen = section_length(sec->secbuf); 271 if (seclen <= 0 || seclen > DMX_MAX_SECTION_SIZE 272 || seclen + sec->secbufp > limit) 273 return 0; 274 sec->seclen = seclen; 275 sec->crc_val = ~0; 276 /* dump [secbuf .. secbuf+seclen) */ 277 if (feed->pusi_seen) 278 dvb_dmx_swfilter_section_feed(feed); 279 #ifdef DVB_DEMUX_SECTION_LOSS_LOG 280 else 281 printk("dvb_demux.c pusi not seen, discarding section data\n"); 282 #endif 283 sec->secbufp += seclen; /* secbufp and secbuf moving together is */ 284 sec->secbuf += seclen; /* redundant but saves pointer arithmetic */ 285 } 286 287 return 0; 288 } 289 290 static int dvb_dmx_swfilter_section_packet(struct dvb_demux_feed *feed, 291 const u8 *buf) 292 { 293 u8 p, count; 294 int ccok, dc_i = 0; 295 u8 cc; 296 297 count = payload(buf); 298 299 if (count == 0) /* count == 0 if no payload or out of range */ 300 return -1; 301 302 p = 188 - count; /* payload start */ 303 304 cc = buf[3] & 0x0f; 305 ccok = ((feed->cc + 1) & 0x0f) == cc; 306 feed->cc = cc; 307 308 if (buf[3] & 0x20) { 309 /* adaption field present, check for discontinuity_indicator */ 310 if ((buf[4] > 0) && (buf[5] & 0x80)) 311 dc_i = 1; 312 } 313 314 if (!ccok || dc_i) { 315 #ifdef DVB_DEMUX_SECTION_LOSS_LOG 316 printk("dvb_demux.c discontinuity detected %d bytes lost\n", 317 count); 318 /* 319 * those bytes under sume circumstances will again be reported 320 * in the following dvb_dmx_swfilter_section_new 321 */ 322 #endif 323 /* 324 * Discontinuity detected. Reset pusi_seen = 0 to 325 * stop feeding of suspicious data until next PUSI=1 arrives 326 */ 327 feed->pusi_seen = 0; 328 dvb_dmx_swfilter_section_new(feed); 329 } 330 331 if (buf[1] & 0x40) { 332 /* PUSI=1 (is set), section boundary is here */ 333 if (count > 1 && buf[p] < count) { 334 const u8 *before = &buf[p + 1]; 335 u8 before_len = buf[p]; 336 const u8 *after = &before[before_len]; 337 u8 after_len = count - 1 - before_len; 338 339 dvb_dmx_swfilter_section_copy_dump(feed, before, 340 before_len); 341 /* before start of new section, set pusi_seen = 1 */ 342 feed->pusi_seen = 1; 343 dvb_dmx_swfilter_section_new(feed); 344 dvb_dmx_swfilter_section_copy_dump(feed, after, 345 after_len); 346 } 347 #ifdef DVB_DEMUX_SECTION_LOSS_LOG 348 else if (count > 0) 349 printk("dvb_demux.c PUSI=1 but %d bytes lost\n", count); 350 #endif 351 } else { 352 /* PUSI=0 (is not set), no section boundary */ 353 dvb_dmx_swfilter_section_copy_dump(feed, &buf[p], count); 354 } 355 356 return 0; 357 } 358 359 static inline void dvb_dmx_swfilter_packet_type(struct dvb_demux_feed *feed, 360 const u8 *buf) 361 { 362 switch (feed->type) { 363 case DMX_TYPE_TS: 364 if (!feed->feed.ts.is_filtering) 365 break; 366 if (feed->ts_type & TS_PACKET) { 367 if (feed->ts_type & TS_PAYLOAD_ONLY) 368 dvb_dmx_swfilter_payload(feed, buf); 369 else 370 feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts, 371 DMX_OK); 372 } 373 if (feed->ts_type & TS_DECODER) 374 if (feed->demux->write_to_decoder) 375 feed->demux->write_to_decoder(feed, buf, 188); 376 break; 377 378 case DMX_TYPE_SEC: 379 if (!feed->feed.sec.is_filtering) 380 break; 381 if (dvb_dmx_swfilter_section_packet(feed, buf) < 0) 382 feed->feed.sec.seclen = feed->feed.sec.secbufp = 0; 383 break; 384 385 default: 386 break; 387 } 388 } 389 390 #define DVR_FEED(f) \ 391 (((f)->type == DMX_TYPE_TS) && \ 392 ((f)->feed.ts.is_filtering) && \ 393 (((f)->ts_type & (TS_PACKET | TS_DEMUX)) == TS_PACKET)) 394 395 static void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf) 396 { 397 struct dvb_demux_feed *feed; 398 u16 pid = ts_pid(buf); 399 int dvr_done = 0; 400 401 if (dvb_demux_speedcheck) { 402 struct timespec cur_time, delta_time; 403 u64 speed_bytes, speed_timedelta; 404 405 demux->speed_pkts_cnt++; 406 407 /* show speed every SPEED_PKTS_INTERVAL packets */ 408 if (!(demux->speed_pkts_cnt % SPEED_PKTS_INTERVAL)) { 409 cur_time = current_kernel_time(); 410 411 if (demux->speed_last_time.tv_sec != 0 && 412 demux->speed_last_time.tv_nsec != 0) { 413 delta_time = timespec_sub(cur_time, 414 demux->speed_last_time); 415 speed_bytes = (u64)demux->speed_pkts_cnt 416 * 188 * 8; 417 /* convert to 1024 basis */ 418 speed_bytes = 1000 * div64_u64(speed_bytes, 419 1024); 420 speed_timedelta = 421 (u64)timespec_to_ns(&delta_time); 422 speed_timedelta = div64_u64(speed_timedelta, 423 1000000); /* nsec -> usec */ 424 printk(KERN_INFO "TS speed %llu Kbits/sec \n", 425 div64_u64(speed_bytes, 426 speed_timedelta)); 427 } 428 429 demux->speed_last_time = cur_time; 430 demux->speed_pkts_cnt = 0; 431 } 432 } 433 434 if (buf[1] & 0x80) { 435 dprintk_tscheck("TEI detected. " 436 "PID=0x%x data1=0x%x\n", 437 pid, buf[1]); 438 /* data in this packet can't be trusted - drop it unless 439 * module option dvb_demux_feed_err_pkts is set */ 440 if (!dvb_demux_feed_err_pkts) 441 return; 442 } else /* if TEI bit is set, pid may be wrong- skip pkt counter */ 443 if (demux->cnt_storage && dvb_demux_tscheck) { 444 /* check pkt counter */ 445 if (pid < MAX_PID) { 446 if (buf[3] & 0x10) 447 demux->cnt_storage[pid] = 448 (demux->cnt_storage[pid] + 1) & 0xf; 449 450 if ((buf[3] & 0xf) != demux->cnt_storage[pid]) { 451 dprintk_tscheck("TS packet counter mismatch. PID=0x%x expected 0x%x got 0x%x\n", 452 pid, demux->cnt_storage[pid], 453 buf[3] & 0xf); 454 demux->cnt_storage[pid] = buf[3] & 0xf; 455 } 456 } 457 /* end check */ 458 } 459 460 list_for_each_entry(feed, &demux->feed_list, list_head) { 461 if ((feed->pid != pid) && (feed->pid != 0x2000)) 462 continue; 463 464 /* copy each packet only once to the dvr device, even 465 * if a PID is in multiple filters (e.g. video + PCR) */ 466 if ((DVR_FEED(feed)) && (dvr_done++)) 467 continue; 468 469 if (feed->pid == pid) 470 dvb_dmx_swfilter_packet_type(feed, buf); 471 else if (feed->pid == 0x2000) 472 feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts, DMX_OK); 473 } 474 } 475 476 void dvb_dmx_swfilter_packets(struct dvb_demux *demux, const u8 *buf, 477 size_t count) 478 { 479 unsigned long flags; 480 481 spin_lock_irqsave(&demux->lock, flags); 482 483 while (count--) { 484 if (buf[0] == 0x47) 485 dvb_dmx_swfilter_packet(demux, buf); 486 buf += 188; 487 } 488 489 spin_unlock_irqrestore(&demux->lock, flags); 490 } 491 492 EXPORT_SYMBOL(dvb_dmx_swfilter_packets); 493 494 static inline int find_next_packet(const u8 *buf, int pos, size_t count, 495 const int pktsize) 496 { 497 int start = pos, lost; 498 499 while (pos < count) { 500 if (buf[pos] == 0x47 || 501 (pktsize == 204 && buf[pos] == 0xB8)) 502 break; 503 pos++; 504 } 505 506 lost = pos - start; 507 if (lost) { 508 /* This garbage is part of a valid packet? */ 509 int backtrack = pos - pktsize; 510 if (backtrack >= 0 && (buf[backtrack] == 0x47 || 511 (pktsize == 204 && buf[backtrack] == 0xB8))) 512 return backtrack; 513 } 514 515 return pos; 516 } 517 518 /* Filter all pktsize= 188 or 204 sized packets and skip garbage. */ 519 static inline void _dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, 520 size_t count, const int pktsize) 521 { 522 int p = 0, i, j; 523 const u8 *q; 524 unsigned long flags; 525 526 spin_lock_irqsave(&demux->lock, flags); 527 528 if (demux->tsbufp) { /* tsbuf[0] is now 0x47. */ 529 i = demux->tsbufp; 530 j = pktsize - i; 531 if (count < j) { 532 memcpy(&demux->tsbuf[i], buf, count); 533 demux->tsbufp += count; 534 goto bailout; 535 } 536 memcpy(&demux->tsbuf[i], buf, j); 537 if (demux->tsbuf[0] == 0x47) /* double check */ 538 dvb_dmx_swfilter_packet(demux, demux->tsbuf); 539 demux->tsbufp = 0; 540 p += j; 541 } 542 543 while (1) { 544 p = find_next_packet(buf, p, count, pktsize); 545 if (p >= count) 546 break; 547 if (count - p < pktsize) 548 break; 549 550 q = &buf[p]; 551 552 if (pktsize == 204 && (*q == 0xB8)) { 553 memcpy(demux->tsbuf, q, 188); 554 demux->tsbuf[0] = 0x47; 555 q = demux->tsbuf; 556 } 557 dvb_dmx_swfilter_packet(demux, q); 558 p += pktsize; 559 } 560 561 i = count - p; 562 if (i) { 563 memcpy(demux->tsbuf, &buf[p], i); 564 demux->tsbufp = i; 565 if (pktsize == 204 && demux->tsbuf[0] == 0xB8) 566 demux->tsbuf[0] = 0x47; 567 } 568 569 bailout: 570 spin_unlock_irqrestore(&demux->lock, flags); 571 } 572 573 void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count) 574 { 575 _dvb_dmx_swfilter(demux, buf, count, 188); 576 } 577 EXPORT_SYMBOL(dvb_dmx_swfilter); 578 579 void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, size_t count) 580 { 581 _dvb_dmx_swfilter(demux, buf, count, 204); 582 } 583 EXPORT_SYMBOL(dvb_dmx_swfilter_204); 584 585 void dvb_dmx_swfilter_raw(struct dvb_demux *demux, const u8 *buf, size_t count) 586 { 587 unsigned long flags; 588 589 spin_lock_irqsave(&demux->lock, flags); 590 591 demux->feed->cb.ts(buf, count, NULL, 0, &demux->feed->feed.ts, DMX_OK); 592 593 spin_unlock_irqrestore(&demux->lock, flags); 594 } 595 EXPORT_SYMBOL(dvb_dmx_swfilter_raw); 596 597 static struct dvb_demux_filter *dvb_dmx_filter_alloc(struct dvb_demux *demux) 598 { 599 int i; 600 601 for (i = 0; i < demux->filternum; i++) 602 if (demux->filter[i].state == DMX_STATE_FREE) 603 break; 604 605 if (i == demux->filternum) 606 return NULL; 607 608 demux->filter[i].state = DMX_STATE_ALLOCATED; 609 610 return &demux->filter[i]; 611 } 612 613 static struct dvb_demux_feed *dvb_dmx_feed_alloc(struct dvb_demux *demux) 614 { 615 int i; 616 617 for (i = 0; i < demux->feednum; i++) 618 if (demux->feed[i].state == DMX_STATE_FREE) 619 break; 620 621 if (i == demux->feednum) 622 return NULL; 623 624 demux->feed[i].state = DMX_STATE_ALLOCATED; 625 626 return &demux->feed[i]; 627 } 628 629 static int dvb_demux_feed_find(struct dvb_demux_feed *feed) 630 { 631 struct dvb_demux_feed *entry; 632 633 list_for_each_entry(entry, &feed->demux->feed_list, list_head) 634 if (entry == feed) 635 return 1; 636 637 return 0; 638 } 639 640 static void dvb_demux_feed_add(struct dvb_demux_feed *feed) 641 { 642 spin_lock_irq(&feed->demux->lock); 643 if (dvb_demux_feed_find(feed)) { 644 printk(KERN_ERR "%s: feed already in list (type=%x state=%x pid=%x)\n", 645 __func__, feed->type, feed->state, feed->pid); 646 goto out; 647 } 648 649 list_add(&feed->list_head, &feed->demux->feed_list); 650 out: 651 spin_unlock_irq(&feed->demux->lock); 652 } 653 654 static void dvb_demux_feed_del(struct dvb_demux_feed *feed) 655 { 656 spin_lock_irq(&feed->demux->lock); 657 if (!(dvb_demux_feed_find(feed))) { 658 printk(KERN_ERR "%s: feed not in list (type=%x state=%x pid=%x)\n", 659 __func__, feed->type, feed->state, feed->pid); 660 goto out; 661 } 662 663 list_del(&feed->list_head); 664 out: 665 spin_unlock_irq(&feed->demux->lock); 666 } 667 668 static int dmx_ts_feed_set(struct dmx_ts_feed *ts_feed, u16 pid, int ts_type, 669 enum dmx_ts_pes pes_type, 670 size_t circular_buffer_size, struct timespec timeout) 671 { 672 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed; 673 struct dvb_demux *demux = feed->demux; 674 675 if (pid > DMX_MAX_PID) 676 return -EINVAL; 677 678 if (mutex_lock_interruptible(&demux->mutex)) 679 return -ERESTARTSYS; 680 681 if (ts_type & TS_DECODER) { 682 if (pes_type >= DMX_PES_OTHER) { 683 mutex_unlock(&demux->mutex); 684 return -EINVAL; 685 } 686 687 if (demux->pesfilter[pes_type] && 688 demux->pesfilter[pes_type] != feed) { 689 mutex_unlock(&demux->mutex); 690 return -EINVAL; 691 } 692 693 demux->pesfilter[pes_type] = feed; 694 demux->pids[pes_type] = pid; 695 } 696 697 dvb_demux_feed_add(feed); 698 699 feed->pid = pid; 700 feed->buffer_size = circular_buffer_size; 701 feed->timeout = timeout; 702 feed->ts_type = ts_type; 703 feed->pes_type = pes_type; 704 705 if (feed->buffer_size) { 706 #ifdef NOBUFS 707 feed->buffer = NULL; 708 #else 709 feed->buffer = vmalloc(feed->buffer_size); 710 if (!feed->buffer) { 711 mutex_unlock(&demux->mutex); 712 return -ENOMEM; 713 } 714 #endif 715 } 716 717 feed->state = DMX_STATE_READY; 718 mutex_unlock(&demux->mutex); 719 720 return 0; 721 } 722 723 static int dmx_ts_feed_start_filtering(struct dmx_ts_feed *ts_feed) 724 { 725 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed; 726 struct dvb_demux *demux = feed->demux; 727 int ret; 728 729 if (mutex_lock_interruptible(&demux->mutex)) 730 return -ERESTARTSYS; 731 732 if (feed->state != DMX_STATE_READY || feed->type != DMX_TYPE_TS) { 733 mutex_unlock(&demux->mutex); 734 return -EINVAL; 735 } 736 737 if (!demux->start_feed) { 738 mutex_unlock(&demux->mutex); 739 return -ENODEV; 740 } 741 742 if ((ret = demux->start_feed(feed)) < 0) { 743 mutex_unlock(&demux->mutex); 744 return ret; 745 } 746 747 spin_lock_irq(&demux->lock); 748 ts_feed->is_filtering = 1; 749 feed->state = DMX_STATE_GO; 750 spin_unlock_irq(&demux->lock); 751 mutex_unlock(&demux->mutex); 752 753 return 0; 754 } 755 756 static int dmx_ts_feed_stop_filtering(struct dmx_ts_feed *ts_feed) 757 { 758 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed; 759 struct dvb_demux *demux = feed->demux; 760 int ret; 761 762 mutex_lock(&demux->mutex); 763 764 if (feed->state < DMX_STATE_GO) { 765 mutex_unlock(&demux->mutex); 766 return -EINVAL; 767 } 768 769 if (!demux->stop_feed) { 770 mutex_unlock(&demux->mutex); 771 return -ENODEV; 772 } 773 774 ret = demux->stop_feed(feed); 775 776 spin_lock_irq(&demux->lock); 777 ts_feed->is_filtering = 0; 778 feed->state = DMX_STATE_ALLOCATED; 779 spin_unlock_irq(&demux->lock); 780 mutex_unlock(&demux->mutex); 781 782 return ret; 783 } 784 785 static int dvbdmx_allocate_ts_feed(struct dmx_demux *dmx, 786 struct dmx_ts_feed **ts_feed, 787 dmx_ts_cb callback) 788 { 789 struct dvb_demux *demux = (struct dvb_demux *)dmx; 790 struct dvb_demux_feed *feed; 791 792 if (mutex_lock_interruptible(&demux->mutex)) 793 return -ERESTARTSYS; 794 795 if (!(feed = dvb_dmx_feed_alloc(demux))) { 796 mutex_unlock(&demux->mutex); 797 return -EBUSY; 798 } 799 800 feed->type = DMX_TYPE_TS; 801 feed->cb.ts = callback; 802 feed->demux = demux; 803 feed->pid = 0xffff; 804 feed->peslen = 0xfffa; 805 feed->buffer = NULL; 806 807 (*ts_feed) = &feed->feed.ts; 808 (*ts_feed)->parent = dmx; 809 (*ts_feed)->priv = NULL; 810 (*ts_feed)->is_filtering = 0; 811 (*ts_feed)->start_filtering = dmx_ts_feed_start_filtering; 812 (*ts_feed)->stop_filtering = dmx_ts_feed_stop_filtering; 813 (*ts_feed)->set = dmx_ts_feed_set; 814 815 if (!(feed->filter = dvb_dmx_filter_alloc(demux))) { 816 feed->state = DMX_STATE_FREE; 817 mutex_unlock(&demux->mutex); 818 return -EBUSY; 819 } 820 821 feed->filter->type = DMX_TYPE_TS; 822 feed->filter->feed = feed; 823 feed->filter->state = DMX_STATE_READY; 824 825 mutex_unlock(&demux->mutex); 826 827 return 0; 828 } 829 830 static int dvbdmx_release_ts_feed(struct dmx_demux *dmx, 831 struct dmx_ts_feed *ts_feed) 832 { 833 struct dvb_demux *demux = (struct dvb_demux *)dmx; 834 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed; 835 836 mutex_lock(&demux->mutex); 837 838 if (feed->state == DMX_STATE_FREE) { 839 mutex_unlock(&demux->mutex); 840 return -EINVAL; 841 } 842 #ifndef NOBUFS 843 vfree(feed->buffer); 844 feed->buffer = NULL; 845 #endif 846 847 feed->state = DMX_STATE_FREE; 848 feed->filter->state = DMX_STATE_FREE; 849 850 dvb_demux_feed_del(feed); 851 852 feed->pid = 0xffff; 853 854 if (feed->ts_type & TS_DECODER && feed->pes_type < DMX_PES_OTHER) 855 demux->pesfilter[feed->pes_type] = NULL; 856 857 mutex_unlock(&demux->mutex); 858 return 0; 859 } 860 861 /****************************************************************************** 862 * dmx_section_feed API calls 863 ******************************************************************************/ 864 865 static int dmx_section_feed_allocate_filter(struct dmx_section_feed *feed, 866 struct dmx_section_filter **filter) 867 { 868 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 869 struct dvb_demux *dvbdemux = dvbdmxfeed->demux; 870 struct dvb_demux_filter *dvbdmxfilter; 871 872 if (mutex_lock_interruptible(&dvbdemux->mutex)) 873 return -ERESTARTSYS; 874 875 dvbdmxfilter = dvb_dmx_filter_alloc(dvbdemux); 876 if (!dvbdmxfilter) { 877 mutex_unlock(&dvbdemux->mutex); 878 return -EBUSY; 879 } 880 881 spin_lock_irq(&dvbdemux->lock); 882 *filter = &dvbdmxfilter->filter; 883 (*filter)->parent = feed; 884 (*filter)->priv = NULL; 885 dvbdmxfilter->feed = dvbdmxfeed; 886 dvbdmxfilter->type = DMX_TYPE_SEC; 887 dvbdmxfilter->state = DMX_STATE_READY; 888 dvbdmxfilter->next = dvbdmxfeed->filter; 889 dvbdmxfeed->filter = dvbdmxfilter; 890 spin_unlock_irq(&dvbdemux->lock); 891 892 mutex_unlock(&dvbdemux->mutex); 893 return 0; 894 } 895 896 static int dmx_section_feed_set(struct dmx_section_feed *feed, 897 u16 pid, size_t circular_buffer_size, 898 int check_crc) 899 { 900 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 901 struct dvb_demux *dvbdmx = dvbdmxfeed->demux; 902 903 if (pid > 0x1fff) 904 return -EINVAL; 905 906 if (mutex_lock_interruptible(&dvbdmx->mutex)) 907 return -ERESTARTSYS; 908 909 dvb_demux_feed_add(dvbdmxfeed); 910 911 dvbdmxfeed->pid = pid; 912 dvbdmxfeed->buffer_size = circular_buffer_size; 913 dvbdmxfeed->feed.sec.check_crc = check_crc; 914 915 #ifdef NOBUFS 916 dvbdmxfeed->buffer = NULL; 917 #else 918 dvbdmxfeed->buffer = vmalloc(dvbdmxfeed->buffer_size); 919 if (!dvbdmxfeed->buffer) { 920 mutex_unlock(&dvbdmx->mutex); 921 return -ENOMEM; 922 } 923 #endif 924 925 dvbdmxfeed->state = DMX_STATE_READY; 926 mutex_unlock(&dvbdmx->mutex); 927 return 0; 928 } 929 930 static void prepare_secfilters(struct dvb_demux_feed *dvbdmxfeed) 931 { 932 int i; 933 struct dvb_demux_filter *f; 934 struct dmx_section_filter *sf; 935 u8 mask, mode, doneq; 936 937 if (!(f = dvbdmxfeed->filter)) 938 return; 939 do { 940 sf = &f->filter; 941 doneq = 0; 942 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) { 943 mode = sf->filter_mode[i]; 944 mask = sf->filter_mask[i]; 945 f->maskandmode[i] = mask & mode; 946 doneq |= f->maskandnotmode[i] = mask & ~mode; 947 } 948 f->doneq = doneq ? 1 : 0; 949 } while ((f = f->next)); 950 } 951 952 static int dmx_section_feed_start_filtering(struct dmx_section_feed *feed) 953 { 954 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 955 struct dvb_demux *dvbdmx = dvbdmxfeed->demux; 956 int ret; 957 958 if (mutex_lock_interruptible(&dvbdmx->mutex)) 959 return -ERESTARTSYS; 960 961 if (feed->is_filtering) { 962 mutex_unlock(&dvbdmx->mutex); 963 return -EBUSY; 964 } 965 966 if (!dvbdmxfeed->filter) { 967 mutex_unlock(&dvbdmx->mutex); 968 return -EINVAL; 969 } 970 971 dvbdmxfeed->feed.sec.tsfeedp = 0; 972 dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base; 973 dvbdmxfeed->feed.sec.secbufp = 0; 974 dvbdmxfeed->feed.sec.seclen = 0; 975 976 if (!dvbdmx->start_feed) { 977 mutex_unlock(&dvbdmx->mutex); 978 return -ENODEV; 979 } 980 981 prepare_secfilters(dvbdmxfeed); 982 983 if ((ret = dvbdmx->start_feed(dvbdmxfeed)) < 0) { 984 mutex_unlock(&dvbdmx->mutex); 985 return ret; 986 } 987 988 spin_lock_irq(&dvbdmx->lock); 989 feed->is_filtering = 1; 990 dvbdmxfeed->state = DMX_STATE_GO; 991 spin_unlock_irq(&dvbdmx->lock); 992 993 mutex_unlock(&dvbdmx->mutex); 994 return 0; 995 } 996 997 static int dmx_section_feed_stop_filtering(struct dmx_section_feed *feed) 998 { 999 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 1000 struct dvb_demux *dvbdmx = dvbdmxfeed->demux; 1001 int ret; 1002 1003 mutex_lock(&dvbdmx->mutex); 1004 1005 if (!dvbdmx->stop_feed) { 1006 mutex_unlock(&dvbdmx->mutex); 1007 return -ENODEV; 1008 } 1009 1010 ret = dvbdmx->stop_feed(dvbdmxfeed); 1011 1012 spin_lock_irq(&dvbdmx->lock); 1013 dvbdmxfeed->state = DMX_STATE_READY; 1014 feed->is_filtering = 0; 1015 spin_unlock_irq(&dvbdmx->lock); 1016 1017 mutex_unlock(&dvbdmx->mutex); 1018 return ret; 1019 } 1020 1021 static int dmx_section_feed_release_filter(struct dmx_section_feed *feed, 1022 struct dmx_section_filter *filter) 1023 { 1024 struct dvb_demux_filter *dvbdmxfilter = (struct dvb_demux_filter *)filter, *f; 1025 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 1026 struct dvb_demux *dvbdmx = dvbdmxfeed->demux; 1027 1028 mutex_lock(&dvbdmx->mutex); 1029 1030 if (dvbdmxfilter->feed != dvbdmxfeed) { 1031 mutex_unlock(&dvbdmx->mutex); 1032 return -EINVAL; 1033 } 1034 1035 if (feed->is_filtering) { 1036 /* release dvbdmx->mutex as far as it is 1037 acquired by stop_filtering() itself */ 1038 mutex_unlock(&dvbdmx->mutex); 1039 feed->stop_filtering(feed); 1040 mutex_lock(&dvbdmx->mutex); 1041 } 1042 1043 spin_lock_irq(&dvbdmx->lock); 1044 f = dvbdmxfeed->filter; 1045 1046 if (f == dvbdmxfilter) { 1047 dvbdmxfeed->filter = dvbdmxfilter->next; 1048 } else { 1049 while (f->next != dvbdmxfilter) 1050 f = f->next; 1051 f->next = f->next->next; 1052 } 1053 1054 dvbdmxfilter->state = DMX_STATE_FREE; 1055 spin_unlock_irq(&dvbdmx->lock); 1056 mutex_unlock(&dvbdmx->mutex); 1057 return 0; 1058 } 1059 1060 static int dvbdmx_allocate_section_feed(struct dmx_demux *demux, 1061 struct dmx_section_feed **feed, 1062 dmx_section_cb callback) 1063 { 1064 struct dvb_demux *dvbdmx = (struct dvb_demux *)demux; 1065 struct dvb_demux_feed *dvbdmxfeed; 1066 1067 if (mutex_lock_interruptible(&dvbdmx->mutex)) 1068 return -ERESTARTSYS; 1069 1070 if (!(dvbdmxfeed = dvb_dmx_feed_alloc(dvbdmx))) { 1071 mutex_unlock(&dvbdmx->mutex); 1072 return -EBUSY; 1073 } 1074 1075 dvbdmxfeed->type = DMX_TYPE_SEC; 1076 dvbdmxfeed->cb.sec = callback; 1077 dvbdmxfeed->demux = dvbdmx; 1078 dvbdmxfeed->pid = 0xffff; 1079 dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base; 1080 dvbdmxfeed->feed.sec.secbufp = dvbdmxfeed->feed.sec.seclen = 0; 1081 dvbdmxfeed->feed.sec.tsfeedp = 0; 1082 dvbdmxfeed->filter = NULL; 1083 dvbdmxfeed->buffer = NULL; 1084 1085 (*feed) = &dvbdmxfeed->feed.sec; 1086 (*feed)->is_filtering = 0; 1087 (*feed)->parent = demux; 1088 (*feed)->priv = NULL; 1089 1090 (*feed)->set = dmx_section_feed_set; 1091 (*feed)->allocate_filter = dmx_section_feed_allocate_filter; 1092 (*feed)->start_filtering = dmx_section_feed_start_filtering; 1093 (*feed)->stop_filtering = dmx_section_feed_stop_filtering; 1094 (*feed)->release_filter = dmx_section_feed_release_filter; 1095 1096 mutex_unlock(&dvbdmx->mutex); 1097 return 0; 1098 } 1099 1100 static int dvbdmx_release_section_feed(struct dmx_demux *demux, 1101 struct dmx_section_feed *feed) 1102 { 1103 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 1104 struct dvb_demux *dvbdmx = (struct dvb_demux *)demux; 1105 1106 mutex_lock(&dvbdmx->mutex); 1107 1108 if (dvbdmxfeed->state == DMX_STATE_FREE) { 1109 mutex_unlock(&dvbdmx->mutex); 1110 return -EINVAL; 1111 } 1112 #ifndef NOBUFS 1113 vfree(dvbdmxfeed->buffer); 1114 dvbdmxfeed->buffer = NULL; 1115 #endif 1116 dvbdmxfeed->state = DMX_STATE_FREE; 1117 1118 dvb_demux_feed_del(dvbdmxfeed); 1119 1120 dvbdmxfeed->pid = 0xffff; 1121 1122 mutex_unlock(&dvbdmx->mutex); 1123 return 0; 1124 } 1125 1126 /****************************************************************************** 1127 * dvb_demux kernel data API calls 1128 ******************************************************************************/ 1129 1130 static int dvbdmx_open(struct dmx_demux *demux) 1131 { 1132 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1133 1134 if (dvbdemux->users >= MAX_DVB_DEMUX_USERS) 1135 return -EUSERS; 1136 1137 dvbdemux->users++; 1138 return 0; 1139 } 1140 1141 static int dvbdmx_close(struct dmx_demux *demux) 1142 { 1143 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1144 1145 if (dvbdemux->users == 0) 1146 return -ENODEV; 1147 1148 dvbdemux->users--; 1149 //FIXME: release any unneeded resources if users==0 1150 return 0; 1151 } 1152 1153 static int dvbdmx_write(struct dmx_demux *demux, const char __user *buf, size_t count) 1154 { 1155 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1156 void *p; 1157 1158 if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE)) 1159 return -EINVAL; 1160 1161 p = memdup_user(buf, count); 1162 if (IS_ERR(p)) 1163 return PTR_ERR(p); 1164 if (mutex_lock_interruptible(&dvbdemux->mutex)) { 1165 kfree(p); 1166 return -ERESTARTSYS; 1167 } 1168 dvb_dmx_swfilter(dvbdemux, p, count); 1169 kfree(p); 1170 mutex_unlock(&dvbdemux->mutex); 1171 1172 if (signal_pending(current)) 1173 return -EINTR; 1174 return count; 1175 } 1176 1177 static int dvbdmx_add_frontend(struct dmx_demux *demux, 1178 struct dmx_frontend *frontend) 1179 { 1180 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1181 struct list_head *head = &dvbdemux->frontend_list; 1182 1183 list_add(&(frontend->connectivity_list), head); 1184 1185 return 0; 1186 } 1187 1188 static int dvbdmx_remove_frontend(struct dmx_demux *demux, 1189 struct dmx_frontend *frontend) 1190 { 1191 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1192 struct list_head *pos, *n, *head = &dvbdemux->frontend_list; 1193 1194 list_for_each_safe(pos, n, head) { 1195 if (DMX_FE_ENTRY(pos) == frontend) { 1196 list_del(pos); 1197 return 0; 1198 } 1199 } 1200 1201 return -ENODEV; 1202 } 1203 1204 static struct list_head *dvbdmx_get_frontends(struct dmx_demux *demux) 1205 { 1206 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1207 1208 if (list_empty(&dvbdemux->frontend_list)) 1209 return NULL; 1210 1211 return &dvbdemux->frontend_list; 1212 } 1213 1214 static int dvbdmx_connect_frontend(struct dmx_demux *demux, 1215 struct dmx_frontend *frontend) 1216 { 1217 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1218 1219 if (demux->frontend) 1220 return -EINVAL; 1221 1222 mutex_lock(&dvbdemux->mutex); 1223 1224 demux->frontend = frontend; 1225 mutex_unlock(&dvbdemux->mutex); 1226 return 0; 1227 } 1228 1229 static int dvbdmx_disconnect_frontend(struct dmx_demux *demux) 1230 { 1231 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1232 1233 mutex_lock(&dvbdemux->mutex); 1234 1235 demux->frontend = NULL; 1236 mutex_unlock(&dvbdemux->mutex); 1237 return 0; 1238 } 1239 1240 static int dvbdmx_get_pes_pids(struct dmx_demux *demux, u16 * pids) 1241 { 1242 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1243 1244 memcpy(pids, dvbdemux->pids, 5 * sizeof(u16)); 1245 return 0; 1246 } 1247 1248 int dvb_dmx_init(struct dvb_demux *dvbdemux) 1249 { 1250 int i; 1251 struct dmx_demux *dmx = &dvbdemux->dmx; 1252 1253 dvbdemux->cnt_storage = NULL; 1254 dvbdemux->users = 0; 1255 dvbdemux->filter = vmalloc(dvbdemux->filternum * sizeof(struct dvb_demux_filter)); 1256 1257 if (!dvbdemux->filter) 1258 return -ENOMEM; 1259 1260 dvbdemux->feed = vmalloc(dvbdemux->feednum * sizeof(struct dvb_demux_feed)); 1261 if (!dvbdemux->feed) { 1262 vfree(dvbdemux->filter); 1263 dvbdemux->filter = NULL; 1264 return -ENOMEM; 1265 } 1266 for (i = 0; i < dvbdemux->filternum; i++) { 1267 dvbdemux->filter[i].state = DMX_STATE_FREE; 1268 dvbdemux->filter[i].index = i; 1269 } 1270 for (i = 0; i < dvbdemux->feednum; i++) { 1271 dvbdemux->feed[i].state = DMX_STATE_FREE; 1272 dvbdemux->feed[i].index = i; 1273 } 1274 1275 dvbdemux->cnt_storage = vmalloc(MAX_PID + 1); 1276 if (!dvbdemux->cnt_storage) 1277 printk(KERN_WARNING "Couldn't allocate memory for TS/TEI check. Disabling it\n"); 1278 1279 INIT_LIST_HEAD(&dvbdemux->frontend_list); 1280 1281 for (i = 0; i < DMX_PES_OTHER; i++) { 1282 dvbdemux->pesfilter[i] = NULL; 1283 dvbdemux->pids[i] = 0xffff; 1284 } 1285 1286 INIT_LIST_HEAD(&dvbdemux->feed_list); 1287 1288 dvbdemux->playing = 0; 1289 dvbdemux->recording = 0; 1290 dvbdemux->tsbufp = 0; 1291 1292 if (!dvbdemux->check_crc32) 1293 dvbdemux->check_crc32 = dvb_dmx_crc32; 1294 1295 if (!dvbdemux->memcopy) 1296 dvbdemux->memcopy = dvb_dmx_memcopy; 1297 1298 dmx->frontend = NULL; 1299 dmx->priv = dvbdemux; 1300 dmx->open = dvbdmx_open; 1301 dmx->close = dvbdmx_close; 1302 dmx->write = dvbdmx_write; 1303 dmx->allocate_ts_feed = dvbdmx_allocate_ts_feed; 1304 dmx->release_ts_feed = dvbdmx_release_ts_feed; 1305 dmx->allocate_section_feed = dvbdmx_allocate_section_feed; 1306 dmx->release_section_feed = dvbdmx_release_section_feed; 1307 1308 dmx->add_frontend = dvbdmx_add_frontend; 1309 dmx->remove_frontend = dvbdmx_remove_frontend; 1310 dmx->get_frontends = dvbdmx_get_frontends; 1311 dmx->connect_frontend = dvbdmx_connect_frontend; 1312 dmx->disconnect_frontend = dvbdmx_disconnect_frontend; 1313 dmx->get_pes_pids = dvbdmx_get_pes_pids; 1314 1315 mutex_init(&dvbdemux->mutex); 1316 spin_lock_init(&dvbdemux->lock); 1317 1318 return 0; 1319 } 1320 1321 EXPORT_SYMBOL(dvb_dmx_init); 1322 1323 void dvb_dmx_release(struct dvb_demux *dvbdemux) 1324 { 1325 vfree(dvbdemux->cnt_storage); 1326 vfree(dvbdemux->filter); 1327 vfree(dvbdemux->feed); 1328 } 1329 1330 EXPORT_SYMBOL(dvb_dmx_release); 1331